Headache, or cephalgia, is literally an ache in the head. Headaches are a common complaint, and are usually a symptom of other problems – ranging from fatigue, stress, eyestrain, sleep deprivation, alcohol consumption, dehydration, and infections, to tumors in the brain. Persistent headaches need to be investigated by a doctor.

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I just saw your post. You really should go show yourself to a doctor. Its not good to constantly have headaches which are so intense that your almost fainting. i used to get headaches because i needed to get glasses but your sounds really bad and more serious. If you dont know who to see in your area you can use the Medindia's "find a doctor" to locate a specialist in your area. Dont wait too long to consult anyone. Best of luck.